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Designing procedurally generated levels

Designing procedurally generated levels

引用

9th AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment, AIIDE 2013 Workshop

作者： Van Linden, Roland Der Lopes, Ricardo Bidarra, Rafael Computer Graphics and Visualization Group Delft University of Technology Netherlands

ISBN: (纸本)9781577356356

There is an increasing demand to improve the procedural generation of game levels. Our approach empowers game designers to author and control level generators, by expressing gameplay-related design constraints. Graph grammars, resulting from these designer-expressed constraints, can generate sequences of desired player actions as well as their associated target content. These action graphs are used to determine layouts and content for game levels. We showcase this approach with a case study on a dungeon crawler game. Results allow us to conclude that our control mechanisms are both expressive and powerful, effectively supporting designers to procedurally generate levels. Copyright © 2013, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Formal languages

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A generic method for classification of player behavior

A generic method for classification of player behavior

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9th AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment, AIIDE 2013 Workshop

作者： Etheredge, Marlon Lopes, Ricardo Bidarra, Rafael Computer Graphics and Visualization Group Delft University of Technology Netherlands

ISBN: (纸本)9781577356356

Player classification allows for considerable improvements on both game analytics and game adaptivity. With this paper we aim at reversing the ad-hoc tendency in player classification methods, by proposing an approach to player classification that can be integrated across different games and genres and is particularly suited to be used by game designers. This paper describes our generic method of interaction-based player classification, which consists of three components: (i) intercepting player interactions, (ii) finding player types through fuzzy cluster analysis and (iii) classification using Hidden Markov Models (HMM). To showcase our method we developed Blindmaze, a simple web-based hidden maze game publicly available, featuring a bounded set of interactions. All data collected from a game is interaction-based, requiring minimal implementation effort from the game developers. It is concluded that our method makes player classification even more available by making it generic and reusable across different games. Copyright © 2013, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Cluster analysis

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Progressive high-quality response surfaces for visually guided sensitivity analysis

Progressive high-quality response surfaces for visually guid...

引用

15th Eurographics Conference on visualization, EuroVis 2013

作者： Demir, I. Westermann, R. Computer Graphics and Visualization Group Technische Universität München Germany

In this paper we present a technique which allows us to perform high quality and progressive response surface prediction from multidimensional input samples in an efficient manner. We utilize kriging interpolation to estimate a response surface which minimizes the expectation value and variance of the prediction error. High computational efficiency is achieved by employing parallel matrix and vector operations on the GPU. Our approach differs from previous kriging approaches in that it uses a novel progressive updating scheme for new samples based on blockwise matrix inversion. In this way we can handle very large sample sets to which new samples are continually added. Furthermore, we can monitor the incremental evolution of the surface, providing a means to early terminate the computation when no significant changes have occurred. When the generation of input samples is fast enough, our technique enables steering this generation process interactively to find relevant dependency relations. © 2013 The Author(s).

关键词： Computational efficiency

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Adding context to multi-touch region selections 13

Adding context to multi-touch region selections

引用

12th International Conference on Mobile and Ubiquitous Multimedia, MUM 2013

作者： Strothoff, Sven Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstraße 62 48149 Münster Germany

ISBN: (纸本)9781450326483

As applications originating on desktop computers find their way onto multi-touch enabled mobile devices many inter- action tasks that were designed for computer mice spread to new touch-based environments. One example is region selection, for instance in image editing applications. Several studies already investigated multi-touch object selections however, region selections have not been closely examined. Our proposed selection technique was designed for multi- touch interaction and better suits mobile devices. Taking advantage of multiple touches enables the user to easily extend, modify and refine selections based on the order and relative position|the context|of touches. We were concerned that controlling more degrees of freedom with our technique could negatively impact simple selections. To evaluate its performance we present a user study that compares it to currently used techniques. Results show that our multi-touch region selection represents a good compromise of speed and precision, while providing the possibility to easily refine the selected region. © 2013 ACM.

关键词： Personal computers

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Adding context to multi-touch region selections 13

Adding context to multi-touch region selections

引用

2013 8th ACM International Conference on Interactive Tabletops and Surfaces, ITS 2013

作者： Strothoff, Sven Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstraße 62 48149 Münster Germany

ISBN: (纸本)9781450322713

As applications that originated on desktop computers find their way onto new multi-touch enabled devices many interaction tasks that were designed for keyboards and computer mice spread to new touch-based environments. One example is the selection of regions, for instance in image editing applications. While there are already several studies involving multi-touch object selections, region selections have not been closely examined. Instead of using traditional mouse-based interaction schemes we propose a multi-touch selection technique that better suits touch-based devices. Based on this technique we propose a novel way to take advantage of multiple touches to easily extend, modify and refine selections based on the order and relative position - the context - of touches. © 2013 Authors.

关键词： Personal computers

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Interactive comparative visualization of multimodal brain tumor segmentation data 18

Interactive comparative visualization of multimodal brain tu...

引用

18th International Workshop on Vision, Modeling and visualization, VMV 2013

作者： Lindemann, F. Laukamp, K. Jacobs, A.H. Hinrichs, K. Visualization and Computer Graphics Research Group University of Münster Germany European Institute for Molecular Imaging Münster Germany

We present a visualization system for the analysis of multi-modal segmentation data of brain tumors. Our system is designed to allow researchers and doctors a further investigation of segmented tumor data beyond a quantitative assessment of size. This includes the efficient visual analysis of the shape and relative position of the different, often overlapping segmented data modalities, using high quality 3D renderings of the data. Furthermore, our system provides visualization methods to compare tumor segmentation volumes acquired at various points of time, which helps the user to explore changes in shape and size before and after treatment. We also employ two novel interactive diagrams which allow the user to quickly navigate and analyze overlapping tumor regions. All methods are assembled and linked in a multi-view framework. © The Eurographics Association 2013.

关键词： Tumors

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Online reconstruction of textured triangle meshes from aerial images

Online reconstruction of textured triangle meshes from aeria...

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2013 Eurographics Workshop on Urban Data Modelling and Visualisation, UDMV 2013

作者： Vierjahn, Tom Roters, Jan Moser, Manuel Hinrichs, Klaus Mostafawy, Sina Rmh New Media GmbH Cologne Germany Visualization and Computer Graphics Research Group Department of Computer Science University of Muenster Germany Department of Media FH Duesseldorf University of Applied Sciences Germany

ISBN: (纸本)9783905674460

In this paper we present and evaluate a new online reconstruction algorithm to create a textured triangle mesh from a set of aerial images via an unorganized point cloud. Both the point cloud and the mesh are iteratively refined while allowing new aerial images to be added at any time during reconstruction. Texture coordinates are learnt to instantly visualize an initially rough approximation that gets refined as more data becomes available. The new algorithm improves upon other systems that require the complete data to be acquired beforehand, and that apply offline, non-iterative reconstruction and processing. Thus, our algorithm is perfectly suited for time-critical applications, e. g., strategical visualization platforms for disaster and emergency response. © 2013 The Eurographics Association.

关键词： Iterative methods

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visualization of big SPH simulations via compressed octree grids

Visualization of big SPH simulations via compressed octree g...

引用

IEEE International Conference on Big Data

作者： Florian Reichl Marc Treib Rüdiger Westermann Technische Universität München Computer Graphics & Visualization Group Munich Germany

ISBN: (纸本)9781479912940

Interactive and high-quality visualization of spatially continuous 3D fields represented by scattered distributions of billions of particles is challenging. One common approach is to resample the quantities carried by the particles to a regular grid and to render the grid via volume ray-casting. In large-scale applications such as astrophysics, however, the required grid resolution can easily exceed 10K samples per spatial dimension, letting resampling approaches appear unfeasible. In this paper we demonstrate that even in these extreme cases such approaches perform surprisingly well, both in terms of memory requirement and rendering performance. We resample the particle data to a multiresolution multiblock grid, where the resolution of the blocks is dictated by the particle distribution. From this structure we build an octree grid, and we then compress each block in the hierarchy at no visual loss using wavelet-based compression. Since decompression can be performed on the GPU, it can be integrated effectively into GPU-based out-of-core volume ray-casting. We compare our approach to the perspective grid approach which resamples at run-time into a view-aligned grid. We demonstrate considerably faster rendering times at high quality, at only a moderate memory increase compared to the raw particle set.

关键词： graphics processing units Rendering (computer graphics) Octrees Three-dimensional displays Instruction sets Smoothing methods Discrete wavelet transforms

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From imprecise user input to precise vessel segmentations

From imprecise user input to precise vessel segmentations

引用

3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Diepenbrock, S. Ropinski, T. Visualization and Computer Graphics Group University of Münster Germany Scientific Visualization Group Linköping University Sweden

ISBN: (纸本)9783905674385

Vessel segmentation is an important prerequisite for many medical applications. While automatic vessel segmentation is an active field of research, interaction and visualization techniques for semi-automatic solutions have gotten far less attention. Nevertheless, since automatic techniques do not generally achieve perfect results, interaction is necessary. Especially for tasks that require an in-detail inspection or analysis of the shape of vascular structures precise segmentations are essential. However, in many cases these can only be generated by incorporating expert knowledge. In this paper we propose a visual vessel segmentation system that allows the user to interactively generate vessel segmentations. Therefore, we employ multiple linked views which allow to assess different aspects of the segmentation and depict its different quality metrics. Based on these quality metrics, the user is guided, can assess the segmentation quality in detail and modify the segmentation accordingly. One common modification is the editing of branches, for which we propose a semi-automatic sketch-based interaction metaphor. Additionally, the user can also influence the shape of the vessel wall or the centerline through sketching. To assess the value of our system we discuss feedback from medical experts and have performed a thorough evaluation. © The Eurographics Association 2012.

关键词： Medical applications

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Interactive editing of GigaSample terrain fields

Interactive editing of GigaSample terrain fields

引用

33rd Annual Conference on European Association for computer graphics, EUROgraphics 2012

作者： Treib, Marc Reichl, Florian Auer, Stefan Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany

Previous terrain rendering approaches have addressed the aspect of data compression and fast decoding for rendering, but applications where the terrain is repeatedly modified and needs to be buffered on disk have not been considered so far. Such applications require both decoding and encoding to be faster than disk transfer. We present a novel approach for editing gigasample terrain fields at interactive rates and high quality. To achieve high decoding and encoding throughput, we employ a compression scheme for height and pixel maps based on a sparse wavelet representation. On recent GPUs it can encode and decode up to 270 and 730 MPix/s of color data, respectively, at compression rates and quality superior to JPEG, and it achieves more than twice these rates for lossless height field compression. The construction and rendering of a height field triangulation is avoided by using GPU ray-casting directly on the regular grid underlying the compression scheme. We show the efficiency of our method for interactive editing and continuous level-of-detail rendering of terrain fields comprised of several hundreds of gigasamples. © 2012 The Author(s).

关键词： Encoding (symbols)

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